search for: pzlepos

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2010 Nov 03
3
optim works on command-line but not inside a function
...],params[2]))) -pos-neg } #IRT.p can also be espressed in terms of z and l #where z=-ab and l=a <- makes it a standard logit function IRT.pZL <- function(theta, z, l){ epow <- exp(-(z+l*theta)) result <- 1/(1+epow) result } #as IRT.oneOverP but now for IRT.pZL IRT.pZLepos <- function(theta, z, l){ epow <- exp(-(z+l*theta)) result <- (1+epow) result } #as IRT.oneOverPneg but now for IRT.pZL IRT.pZLeneg <- function(theta, z, l){ epow <- exp(z+l*theta) result <- (1+epow) result } #The loglikelihood of IRT, but now expre...